Lesson 5 - Levels of Organization The 5 levels of organization 1st Level--Cells 2nd Level--Cells make up tissues 3rd Level--Tissues make up organs 4th Level--Organs make up organ systems 5th Level--Organ systems make up the organism!

Let’s put these 5 levels together. Level 1 – Cells (Heart) Level 2 – Tissues (Veins, Arteries, Capillaries) ---------> Level 3 – Organs (Heart) Level 5 – Organism (You) Level 4-Organ System (Circulatory System) ------------------------>

1. Epithelial 2. Connective 3. Muscle 4. Nervous 4 types of Human Tissue 1. Epithelial 2. Connective 3. Muscle 4. Nervous

1st- Epithelial Tissue Closely packed cells that cover body surfaces and the Internal structures. Examples- Skin and blood vessels

2nd – Connective Tissue Has many different forms and functions Examples: Bone, Fat, Cartilage, Blood

3rd – Muscle Tissue Contracts to allow movement. Examples: Heart, Biceps, Tongue

4th – Nervous Tissue Transmits and processes information. Examples: Spinal Cord, Brain, Nerves

The Organ Systems of the Human Body 7. Skeletal 1. Respiratory 8. Reproductive 2. Circulatory aka--Cardiovascular 9. Endocrine 3. Nervous 10. Immune 4. Digestive aka--Lymphatic 5. Urinary 11. Integumentary aka--Excretory 6. Muscular

1st Body System - Respiratory Organs – Mouth, nose, pharynx, larynx, trachea, bronchi, lungs Function – Provides oxygen to the body’s cells for Cellular respiration; removes Carbon dioxide as waste from the body.

2nd Body System - Circulatory Aka: Cardiovascular Organs – Heart, blood, blood vessels Function – Carries oxygen and food to the cells and carbon dioxide away from the cells as waste; fights infection.

3rd Body System - Nervous Organs – Brain, spinal cord, peripheral nerves, sense organs Function – Organizes the body’s response to stimuli, or changes in its internal or external environment.

4th Body System - Digestive Organs – Mouth, pharynx, esophagus, stomach, small and large intestines. Function – Breaks down food into smaller particles that can be used by the body’s cells for energy.

5th Body System – Urinary Aka: Excretory Organs – Skin, lungs, kidneys, Ureters, urinary bladders, urethra Function – Removes waste from the body.

6th Body System - Muscular Organs – Skeletal muscles, smooth muscles, heart (cardiac) Function – Works with skeletal system to produce movement.

7th Body System - Reproductive Organs – Male: Produces and delivers sperm. Female: Produces eggs and nourishes and shelters the unborn baby.

8th Body System - Skeletal Organs – Bones, cartilage, ligaments, tendons Function – Supports the body and protects internal organs.

9th Body System - Endocrine Organs – Pancreas, ovaries (in females), testes (in males), hypothalamus, pituitary, thyroid, adrenal glands Function – Controls growth, development, metabolism, and reproduction. HORMONES!!

10th Body System - Immune Works with the Lymphatic system Organs – White blood cells, thymus, spleen, lymph nodes, lymph vessels. Function – Protects the body from disease.

11th Body System - Integumentary Organs – Skin, hair, nails, sweat and oil glands. Function – Acts as a barrier against infection and injury.

Discussion Question Identify an activity you were involved in recently. Then describe how at least three of your organ systems cooperated to make the activity possible. Which of the following is not a level of organization in the human body? A. Organelle C. Tissue B. Cell D. Organ Answer: A

2. Which of the following shows the. correct order of the levels of 2. Which of the following shows the correct order of the levels of organization from simplest to most complex? A. organ system, organ, tissue, cell B. cell, tissue, organ, organ system C. tissue, cell, organ system, organ D. organ system, tissue, cell, organ Answer: B

3. A group of organ systems makes up A. an organelle. B. a cell. C. a tissue. D. an organism. Answer: D 4. Which type of tissue are bones made of? A. epithelial B. connective C. muscle D. nervous Answer: B

5. Which level of organization is represented by a 5. Which level of organization is represented by a group of different tissues that work together to perform a function? A. cell B. tissue C. organ D. organism Answer: C